The ceremony is believed to have originated in the time of King Ramkhamhaeng o f Sukhothai, the first capital of thailand, and to have been started by Nang Nophamas or Tao Sri Chulalak, the Brahman consort of the King. She was the first person who introduced "Krathongcherm" . the banana leaf krathong in the form of lotus blassom on the festival night. The festival starts in the evening when there is a full moon in the sky.